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The Growth of Small Fatigue Cracks in 7075?t6 Aluminum
Summary
This fracture mechanics study showed that small fatigue cracks in aluminum alloys grow much faster than larger cracks, linked to localized plastic deformation around crack tips. This materials engineering study has no connection to environmental microplastics or human health.
Abstract— The growth of ‘small’, half-penny shaped surface fatigue cracks in a precipitation hardened aluminum alloy is compared with the growth of ‘large’cracks in fracture mechanics type specimens. It is found that the small cracks grow much faster than LEFM equivalent large ones, and also experience growth rate perturbations. It is suggested that localized microplasticity in nominally elastic specimens is responsible for the rapid growth of small cracks and that grain size limitations on the microplastic regions cause transient decelerations and sometimes permanent arrest, in crack growth.
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